Abstract
Abstract To improve out-coupling efficiency of organic light-emitting diodes, we developed a light scattering hole transport layer with randomly distributed silver nanoparticles by in-situ silver nanoparticle generation process from a mixed precursor solution of poly(9-vinylcarbazole) (PVK) and AgClO4. A solution of PVK and AgClO4 provided the silver nanoparticle dispersed hole transport layer by spin coating process followed by thermal annealing. We observed that the simply fabricated silver nanoparticle embedded hole transport layer played a role of light extraction layer by scattering and enhanced the maximum luminance, external quantum efficiency and angle dependence of the luminance in the green phosphorescent devices. In particular, it was found that higher luminance at high measurement angle than Lambertian light distribution was observed, which confirmed the light scattering effect of the in-situ generated silver nanoparticle embedded hole transport layer.
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